1. Volume 25, Issue 13, Pages 3603-3617.e2 (December 2018)
Precise Post-translational Tuning Occurs for Most Protein Complex Components during Meiosis 
Amy Rose Eisenberg, Andrea Higdon, Abdurrahman Keskin, Stefanie Hodapp, Marko Jovanovic, Gloria Ann Brar 
Cell Reports 
Volume 25, Issue 13, Pages e2 (December 2018)
DOI: /j.celrep
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2. Cell Reports 2018 25, 3603-3617.e2DOI: (10.1016/j.celrep.2018.12.008)
Copyright © 2018 The Author(s) Terms and Conditions

3. Figure 1
Regulated Protein Degradation Can Be Detected by Analysis of Protein Levels during Meiosis
(A) Schematic of meiotic gene expression experiment. Illustrations representing vegetative growth or meiotic stage are used to depict sample identity throughout figures. Left-hand vegetative cells are exponentially growing, and far-right cells are in nutrient-poor sporulation medium. Meiotic stages are noted above central portion of illustration and time in sporulation medium is noted directly below.
(B–D) Comparison of translation, assayed by ribosome footprint density (blue) and protein, assayed by quantitative mass spectrometry (black) are shown over time points for (B) Cdc28 (green box highlights a period of inferred protein stability; RPKM, reads per kilobase million); (C) Zip1 (pink box highlights a period of inferred protein instability that matches known regulation); and (D) Sic1 (pink box highlights a period of inferred protein instability that matches known regulation).
(E) Protein fold changes between sequential time points were calculated for genes (n = 4,464) quantified by mass spectrometry (i.e., first column is 1.5 hr/0 hr protein abundance ratio, and so on). Values were subjected to hierarchical clustering. A cluster containing known Ama1 targets are noted at middle right.
See also Figure 2.
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4. Figure 2
Protein Co-clustering Is Predictive of Shared Degradation Regulation by Ama1
(A) mRNA levels over time for known and predicted Ama1 targets. The green box highlights a period of matched mRNA induction timing, consistent with known transcriptional co-regulation.
(B) Translation levels over time for known and predicted Ama1 targets.
(C) Protein levels over time for known and predicted Ama1 targets. The pink box highlights a period of decrease in protein levels that is matched in timing and degree, suggesting co-regulation.
(D–H) Western blot analysis and quantification for protein levels of meiotic proteins, with and without AMA1. (D) Known Ama1-dependent degradation target Ssp1, (E) known Ama1-dependent degradation target Ndt80, (F) predicted Ama1 target Pes4, (G) predicted Ama1 target Mip6, and (H) Stu2.
See also Figures 1 and S1.
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5. Figure 3
Meiotic Cells Are Capable of Perfect Synthesis Matching of Heterodimer Partners, but It Is Uncommon
(A–F) Z-score plots show gene expression level trends of mRNA levels (left), translation levels (middle), and protein levels (right) over all time points for pairs of genes, including (A) heterodimer Tub1 and Tub2, (B) heterodimer Rbg1 and Tma46, (C) heterodimer Pob3 and Spt16, (D) heterodimer Gtr1 and Gtr2, (E) sequential enzymes involved in purine nucleotide biosynthesis Ade1 and Ade2, and (F) sequential enzymes involved in histidine biosynthesis His2 and His5.
(G) Correlation coefficients for translation and protein between annotated heterodimer partners are shown at left. Yellow represents higher, blue represents lower. The same scaling is used at upper right to compare to a subset of sequential enzymes in biosynthetic pathways. Below right, a summary of trends for heterodimers and adjacent enzymes in biosynthetic pathways. Heterodimer partners show a greater protein than translation correlation, while sequential biosynthetic enzymes show the opposite trend.
(H) Cumulative distribution plots for the translation and footprint correlations in (G). Translation correlations are indistinguishable for the heterodimers and biosynthetic pathway genes, but protein correlations are significantly higher for the heterodimers as assessed by the Kolomogorov-Smirnov (K-S) test.
See also Figures S2, S3, and S4.
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6. Figure 4
Members of Multiprotein Complexes Show Higher Agreement of Protein Levels during Meiosis than Translation, While Members of Biosynthetic Pathways Do Not
(A–J) Z-score plots to show gene expression level trends of translation levels (middle) and protein levels (right) are shown over all time points for groups of genes, including all quantified members of representative protein complexes and biosynthetic pathways: (A) the OST complex, (B) the CCT complex, (C) the F1F0 ATPase complex, (D) the HDA complex, (E) the EMC complex, (F) the heme biosynthesis pathway, (G) the pyrimidine biosynthesis pathway, (H) the ergosterol biosynthesis pathway, (I) the Ccr4-Not complex, and (J) the exosome complex.
See also Figure S5.
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7. Figure 5
Among Highly Correlated Protein-level Trends for Complex Members, Outliers Suggest Non-constitutive Association
(A) Hierarchical clustering of levels of exosome complex components (from Figure 4J) for mRNA (left), translation (middle), and protein (right). Mpp6 (red) is a non-constitutive component and clusters far from others at the protein level. Rrp6/Lrp1 (green) is a non-constitutive heterodimer; these genes cluster closely to each other but separate from the core exosome complex at the protein level.
(B) Hierarchical clustering of protein data for proteasome components and accessory factors. Matched mRNA (far left) and translation levels (middle). Note two discrete protein-level clusters—one with all 20S components except Pre9 and the other cluster with all 19S components. Far right, a proteasome illustration is color coded to match gene names to its left.
(C) All 19S regulatory (orange) and 20S core (blue) proteasome members were analyzed together, scaled to the maximum value measured for each. The means and SDs (bars) are shown for mRNA (left), translation (middle), and protein (right). Note protein divergence between the two groups of genes at late time points (represented by gray box), suggesting synthesis co-regulation for all but independent post-translational adjustment for two complexes at late stages.
See also Figure 4.
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8. Figure 6 RPs Are Actively Degraded Late in the Meiotic Program
(A) Hierarchical clustering of protein levels was performed for all RP genes quantified (right), and is compared to matched translation (middle) and mRNA (left). Values shown are z-score normalized.
(B) Quartile analysis of all RPs at all levels of expression. Pink shading represents period late in meiosis when transcription and translation increase but protein decreases, a hallmark of active degradation.
(C) A strategy to identify active protein degradation and re-synthesis after spore wall formation. This approach uses heterozygous GFP tagging of the protein of interest, in this case Rpl26b, in diploid cells. Before spore formation, protein from both alleles is in the cytosol. After spore formation, if a protein is degraded and re-synthesized, then the fluorescent signal should decrease in spores that inherited the untagged allele and should increase in spores that inherited the tagged allele. This is observed for Rpl26b, but not histone protein Htb1. Inset numbers represent frame numbers for 20-min intervals; scale bar represents 2 μM.
(D) Quantification of the fluorescence over time for the two cells in (C), starting when spore individualization begins. Note the decrease in GFP signal in two spores and the increase in the other two.
(E) Quantification of additional cells (n = 10 tetrads) from the experiment in (C) and (D) and a similar experiment using heterozygous RPL29-GFP. Error bars represent SD. p values determined by paired t test: ∗p = 0.033, ∗∗∗p <
See also Figure S6.
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